Nervous & Endocrine Systems

Understand the role of the Nervous System.
Understand what Stimuli, Receptors and Effectors are.
Understand the role of Motor and Sensory Neurons.
Understand the role of Axons and Impulses.
Stimuli
Receptor
Effector
Settler Activity
Nervous System
• Things are happening around you all the time. You have to detect and respond to many changes. But how does your body do this
• Your body responds to changes in ways
• Can you think which systems are involved?
• Nervous system
• Hormonal system
• Your nervous system sends electrical messages along your nerves to and from different parts of your body.
• Your hormonal system sends chemical messages around your body in the blood.
• The electrical messages and the chemical messages tell your body what to do.
Getting a reaction
• All our reactions happen in the same way. There are always
• Stimuli
• Receptors
• Effectors
• Stimuli are changes that can be detected
• Receptors detect the changes
• Effectors bring about the responses
• What happens if you sit down on a drawing pin?
• The stimulus is the drawing pin
• The receptors are the muscles in your legs
• Your response is to get up quickly
• The Chain of events is:
Stimulus Receptor Coordinator Effector Response
The coordinator is the part of the body decides what to do
What do you think the coordinator is in our example?
Your Nervous System
• The nervous system control your actions. It coordinates different parts of your body so that they work together and are able to bring about the correct responses
• Your nervous system coordinates your muscles, so that you can walk, run, write, read etc
• When you smile the nervous system coordinates the muscles in your face
• Your nervous system also coordinates things that you don’t even think about, like swallowing, blinking and breathing.
The main parts of the nervous system are the Brain and the Spinal Cord.
Together they are called the Central Nervous System.
The Brain is protected...

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